Tapered roller bearing · 320 X series
32018X bearing
90 × 140 × 32 mm
The 32018X is a tapered roller bearing with a 90 mm bore, 140 mm outside diameter and 32 mm total width. Thin, compact series; the X marks the ISO-compliant design.
- Bore d
- 90 mm 3.5433 in
- Outside diameter D
- 140 mm 5.5118 in
- Total width T
- 32 mm 1.2598 in
- Cone width B / cup width C
- 32 / 24 mm
- Dimension series
- 20
- Load directions
- Heavy combined radial and axial (one direction per bearing)
Designation explained
What 32018X means
Standard bearing numbers encode the type, the dimension series and the bore. Anything after the base number — seals, clearance, cage — is a suffix.
| Part | Meaning |
|---|---|
3 | Tapered roller bearing |
20 | Dimension series 20 (ISO 355) |
18 | 18 → 90 mm bore (18 × 5) |
X | Design conforming to the ISO dimension plan for this series |
Variants
Common 32018X variants
Suffixes change the bearing without changing its boundary dimensions. The exact letters differ between manufacturers — always order by the full designation from the maker you choose.
| Suffix | Example | Meaning |
|---|---|---|
J2 / Q (SKF) | 32018X-J2/Q | Pressed steel cage / optimised contact geometry |
A / U / D | 32018X-A | Internal design variants from different makers (e.g. FAG A, NTN U, NTN D steep angle) |
Cone / cup | 32018X cone | Tapered bearings are separable; cone (inner) and cup (outer) can be sold separately |
DF / DB / pair | 32018X-DF | Matched pairs for preloaded arrangements |
Same bore
Other 90 mm bore bearings
Every standard bearing in this reference with a 90 mm bore, from light to heavy sections.
| Designation | Type | D | B / H |
|---|---|---|---|
| 6018 | Deep groove ball bearing | 140 mm | 24 mm |
| 6218 | Deep groove ball bearing | 160 mm | 30 mm |
| 6318 | Deep groove ball bearing | 190 mm | 43 mm |
| 6418 | Deep groove ball bearing | 225 mm | 54 mm |
| 61818 | Deep groove ball bearing | 115 mm | 13 mm |
| 61918 | Deep groove ball bearing | 125 mm | 18 mm |
| 1218 | Self-aligning ball bearing | 160 mm | 30 mm |
| 1318 | Self-aligning ball bearing | 190 mm | 43 mm |
| 2218 | Self-aligning ball bearing | 160 mm | 40 mm |
| 2318 | Self-aligning ball bearing | 190 mm | 64 mm |
| 7218 | Angular contact ball bearing | 160 mm | 30 mm |
| 7318 | Angular contact ball bearing | 190 mm | 43 mm |
| NU218 | Cylindrical roller bearing | 160 mm | 30 mm |
| NU318 | Cylindrical roller bearing | 190 mm | 43 mm |
| NU2218 | Cylindrical roller bearing | 160 mm | 40 mm |
| NU2318 | Cylindrical roller bearing | 190 mm | 64 mm |
| 22218 | Spherical roller bearing | 160 mm | 40 mm |
| 22318 | Spherical roller bearing | 190 mm | 64 mm |
| 30218 | Tapered roller bearing | 160 mm | 32.5 mm |
| 30318 | Tapered roller bearing | 190 mm | 46.5 mm |
| 32218 | Tapered roller bearing | 160 mm | 42.5 mm |
| 51118 | Thrust ball bearing | 120 mm | 22 mm |
| 51218 | Thrust ball bearing | 135 mm | 35 mm |
| 51318 | Thrust ball bearing | 155 mm | 50 mm |
| UCP218 | Pillow block bearing unit | — | — |
Where to buy
Find 32018X at sellers
Search results on independent sellers. We are not affiliated with them, do not earn from these links and do not see their prices or stock. Results mix brands and variants — check the full designation before you order.
About these dimensions. Boundary dimensions follow ISO 355 (metric tapered roller bearings — boundary dimensions), dimension series 20, and are the same for every manufacturer of a standard 32018X. Chamfers, load ratings, speed limits and weight depend on the manufacturer and design and are not shown — use the maker's datasheet for engineering decisions. Last checked 9 October 2026. Spotted an error? Tell us.
Learn more
What size is a 32018X bearing?
A 32018X is a tapered roller bearing with a 90 mm bore, 140 mm outside diameter and 32 mm total width (T) (90 × 140 × 32 mm). These boundary dimensions follow the ISO dimension plan, so they are the same across manufacturers.
What are the cone and cup widths of a 32018X?
The cone (inner ring) is 32 mm wide and the cup (outer ring) 24 mm; assembled, the bearing measures 32 mm (T). Cones and cups of the same designation are interchangeable between manufacturers that follow ISO 355.
Can I replace 32018X with another bearing of the same size?
Other bearing types can share the same 90 × 140 × 32 mm envelope, but a different type has different load directions, speed limits and mounting needs. Same dimensions alone do not make two bearings interchangeable.
Where are the load ratings and speed limits?
They depend on the manufacturer and internal design, so we do not list a single value. Check the datasheet for the exact full designation you intend to use.
Need 32018X data for a whole catalog?
We can help with that.
Normalized specifications, variants and supplier listings for every bearing you sell, with the source behind each value.